docs: update CHANGELOG.md for v0.29.1-beta.0

Author: github-actions[bot]

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+This changelog is automatically generated from merged pull requests.
+
+## [v0.29.1-beta.0] - 2026-01-26
+
+### Features
+
+- Refactor closure capture analysis and remove collectCapturedNames ([#3](https://github.com/btc-vision/assemblyscript/pull/3)) by @BlobMaster41
+
+### Other Changes
+
+- feat: Add experimental closures support with feature flag ([#1](https://github.com/btc-vision/assemblyscript/pull/1)) by @BlobMaster41
+- Refactor closure capture logic and add closures test config ([#4](https://github.com/btc-vision/assemblyscript/pull/4)) by @BlobMaster41
+- Refactor closure capture analysis and minor cleanups ([#5](https://github.com/btc-vision/assemblyscript/pull/5)) by @BlobMaster41
+- Refactor closure capture analysis and recompilation logic ([#6](https://github.com/btc-vision/assemblyscript/pull/6)) by @BlobMaster41
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+